This is more practical advice than GMB advice, but I thought I'd share what worked for one of my lawyer clients.
They had a primary fully staffed office in one location, but needed another office in a nearby location closer to a different court. They wanted to avoid a Regus or DaVinci virtual office center for fear of penalty, but didn't want to pay for a full time office.
They set up an arrangement with another non-competing lawyer to lease an office and share the conference room and receptionist. Both attorneys now share the same address, but have their own websites and phone numbers. They both rank in the three packs for their respective categories in a major market.
Correct me if I'm wrong, but I believe that they are both in compliance with GMB guidelines since the office is staffed during the stated business hours.